Heat exchange apparatus



Jan. 16, 1951 M. FRISCH HEAT EXCHANGE APPARATUS Filed June 13, 1944 /5 INVENTOR MART/N FQ/SCH ATTORNEY Patented Jan. l6, 1951 Martin Frisch, New York, N. Y., minor to Foster Wheeler Corporation, New York, N. Y., a corporation oi New York Application June 13, 1944, Serial No. 540,024

This invention relates to heat exchange apparatus having'tubular members, and more particularly pertains to extended surfaces for the tubular members thereof.

The invention provides novel arrangements of extended surface elements on a tubular member and novel methods of securing the elements to the member.

The invention will be understood from the following description when considered in connection with the accompanying drawing formin a part thereof. and in which:

Fig. l is a view in elevation, with parts in section, ofpart of a tubular member having extended surface elements arranged thereon and secured thereto in accordance with the invention.

Fig. 2 is a perspective view on a reduced scale of one of the extended surface elements shown in Fig. 1.

Fig. 3 is a view similar to Fig. 1, showing another arrangement of elements thereon, and

Fig. 4 is a view similar to Fig. 2 but of an extended surface member having a plurality of radia ly extending projections.

Referring to Figs. 1 and 2 of the drawing. reference character It! designates a tubular member provided with extended surface elements ll of the type shown in Fig. 2. Each element consists of a hub I2 and an annular flange l3 .which is integral with the hub at one end thereof, and extends transversely to the axis of the tubular member on which the element is mounted.

In Fig. l, the elements ii are arranged on the tubular member in pairs, designated It, with the hubs H of each pair in abutment at their outer ends, or with the hubs included between the flanges l3 of each pair, either in contact as shown in Fig. 1, or in slightly spaced relationship. With this arrangement, the axial length of the hub of each element I I need only be half the distance the flanges l3 are spaced on the tubular member, instead of a length equal to the entire distance between the flanges which would be required if the elements were arranged with their hubs all extending in the same direction. This is advan- 5 Claims. (01. 257-26216) tageous because the difficulty of pressing or forming the'hub from the disk is reduced materially since the metal does not have to be drawn out or thinned as much with the result that the possibility of producing cracks is diminished and a' greater metal cross-section is provided in the hub for the flow of heat to the tubular member.

The pairs H of elements are spaced apart by annular spacers l5 which fit the tubular member iii and are in engagement at their ends with the 2 a flanges it of the adjacent elements. Preferably, the spacers I! have an axial length sui'iicient to space apart the pairs it the same distance the elements of each pair are spaced, so that all the elements on the tubular member will be spaced equally. The spacers l5 also function as protecting rings for the tubular members.

The elements Ii preferably are secured to the tubular member by electric resistance seam welding, by the welding of the outer or the adjacent end portions of the hubs of each pair of elements H to the tubular member simultaneously. This may be accomplished by the use of a welding wheel having a width at its outer periphery in a direction parallel to the axis of the wheel, which is suflicient to engage simultaneously the outer end portions of the hubs I! of each pair of elements I4, and to effect the welding of these portions of the hubs to the tubular member at the same time, to make a seam weld i6. With this method, the hubs of each pair of elements are welded together as well as being welded to the tubular member.

As shown, the spacers and protecting rings II also are welded to the tubular member as indicated at H, by the use of a welding wheel, but the welding .or other securing means may be omitted, if desired.

In Fig. 3, the elements are positioned on the tubular member in pairs I8 with the flanges of adjacent pairs in contact, and with the'hubs of each pair in abutment and welded to the tubular member and to each other as indicated at 18, preferably in the manner described for the making of the welds 16. With this arrangement, spacers such as the spacers l5 of Fig. 1, are not required. The ends of adjacent hubs: may be spaced apart somewhat, if desired.

In lieu of welding the hubs of the extended surface elements and the spacers to the tubular members, they may be secured by soldering or brazing.

'The flanges of the extended surface elements may be of any desired configuration. For example, they may consist of a plurality of radially extending projections, with all the projections in the same plane, as disclosed in Fig. 4 of the drawing. If the arrangement of Fig. 3 hereof is employed with elements having radially extending projections such as are disclosed in Fig. 4, the projections on the flanges which are in contact preferably should be disposed in staggered relationship to increase the turbulence of the medium flowing in contact with these projections, and the heat transfer rate.

The forms of the invention disclosed are to be considered as preferred forms, and the invention is not to be limited excepting by the scope of the appended claims.

What is claimed is: I a

1. Heat exchange apparatus comprising a tubular member with extended-surface elements thereon, the. elements having a tubular hub mounted .on said member, the hub extending axially of and surrounding the tubular member with the inner peripheral surface of the hub engaging the outer peripheral surface of the tubular member, and a single solid flange member projecting outwardly of the hub at one peripheral end thereof, the extended surface elements being so disposed on the tubular member that the end opposite said one end of the hub of an element is in abutment with the end opposite said one end of the hub of an adjacent element, the adjacent hubs being welded together at said abutting ends and to the tubular member, the single solid flange member of adjacent elements pro iecting outwardly at said one end of the ad acent hubs in spaced relationship to one another throu hout their length.

2. Heat exchange apparatus comprising a tubular member /.with extended surface elements thereon. the elements having a tubular hub mounted on said member, the hub extending axially of and surrounding the tubular member with the inner peripheral surface of the hub engaging the outer peripheral surface of the tubular member, and a single solid flange member projecting outwardly of the hub at one peripheral end thereof, the extended surface elements being arranged in pairs and so disposed on the tubular member that the end opposite said one end of the hub of one element of said pair is in abutment with the end opposite said one end of the hub of the other element of said pair, the hubs of said pair being welded'together at said abutting ends and to the tubular member, the single solid flange member of adjacent elements projecting outwardly at said one end of the adjacent hubs in spaced relationship to one another throughout their length.

3. Heat exchange apparatus comprising a tubular member with extended surfaceelements thereon. the elements having a tubular hub 'mounted on said member, the hub extending axially of and surrounding the tubular member with the inner peripheral surface of the hub engaging the outer peripheral surface of the tubular member, a single solid flange member projecting outwardly of the hub at one peripheral end thereof, the extended surface elements being arranged in pairs and so disposed on the tubular member that the end opposite said one end of the hub of one element of said pair is in abutment with the end opposite said one end of the hub of the other element of said pair, the single solid flange member of adjacent elements projecting outwardly at said one end of the adjacent hubs in spaced relationship to one another throughout their length, and tubular spacers on the tubular member between adjacent pairs of elements. V

4. Heat exchange apparatus comprising a tu- 4 bular member with extended surface elements thereon, the elements having a tubular hub mounted on said member, the hub extending axially of and surrounding the tubular member with the inner peripheral surface of the hub ongaging the outer peripheral surface of the tubular member, a single solid flange member projecting outwardly of the hub at one peripheral end thereof, the extended surface elements being arranged in pairs and so disposed on the tubular member that the end opposite said one end of the hub of one element of said pair is in abutment with the end opposite said one end of the hub 01' the other element of said pair, the hubs of said pair being welded together at said abutting ends and to the tubular member, the single solid flange member of adjacent elements projecting outwardly at said one end of the adjacent hubs in spaced relationship to one another throughout their length, and tubular spacers welded onto the tubular member between adjacent pairs of elements.

5. Heat exchange apparatus comprising a tubular member with extended surface elements thereon, the elements having a tubular hub mounted on said member, the hub extending axially of and surrounding the tubular member with the inner peripheral surface of the hub engaging the outer peripheral surface of the tubular member, a single solid flange member projecting outwardly of the hub at one peripheral end thereof, the extended surface elements being ar-. ranged in pairs and so disposed on the tubular member that the end opposite said one end of the hub of one element of said pair is in abutment with the end opposite said one end of the hub of the other element of said pair, the hubs of said pair being welded together at said abutting ends and to the tubular member, the single solid flange member of adjacent elements projecting outwardly at said one end of the adjacent hubs at a right angle to the longitudinal axis of the hub and tubular member, andtubular spacers welded onto the tubular member between adjacent pairs of elements, the spacers being of an axial length substantially equal to the distance between the flange members of said pair of elements.

MARTIN FRISCH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 785,081 Brinkman Mar. 21, 1905 1,800,448 Henshall Apr. 14, 1931 1,827,025 Larmer et al Oct. 13, 1931 1,943,557 Ruthenburg et al. Jan. 16, 1934 r 1,956,617 Jafie May 1, 1934 2,201,024 Brown May 14, 1940 2,204,332 Trent June 11, 1940 2,307,355 Bredeson Jan. 5,1943

FOREIGN PA'I'ENIS Number Country Date 607,459 France Mar. 27, 1926 265,698 Germany Mar. 16. 1913 

